Improvement in line-wires for telegraphs



M. G. FARMER xv G. P. MILLIKBN. TELEGRAPH WIRE.

No. 47,940 Patented May 30, 1865.

UNITED STATES PATENT OFFICE.

MOSES G. FARMER, OF SALEM, AND GEO. F. MILLIKEN, OF BOSTON, MASS.

IMPROVEMENT IN LINE-WIRES FOR TELEGRAPHS.

Specioation forming part of Letters Patent No. 47.940. dated May 30, 1865.

To all whom it may concern:

Be it known that we, MosEs G. FARMER, of Salem, Essex county, and GEORGE F. MIL- LIKEN, .of Boston, Suii'olk county, both of the State ot' Massachusetts, have invented Im-V proved Telegraph-Wire 5 and we do hereby declare that the following, taken in vconnection with the drawings which accompany and form part ot' this speciiication, is a description of our invention suiicient to enable those skilled in the art to practice it.

In the construction oi' aerial telegraph-lines the general practice, as is well known, is to use iron wire for transmission of the electric eur rent, this wire being galvanized or covered with a thin coating of zinc to prevent oxidation. In the earlier constructions `of lines it was sometimes attempted to use copper wire, but for want of tensile strength in such wire its use had to be abandoned. Yet the employment of copper wire is a desiderata-m on account of its great superiority over iron as a conductor, and could its tensile strength be madeequal to that of iron it would, to a great evtent, supersede the iron wire.

The object of our invention has been to obtain a copper wire possessing the requisite degrec of strength. for aerial telegraph-lines, and we accomplish this 'by coring a copper wire with i'ron or steel, or by covering copper wire Awith iron or steel, the copper serving mainly for the purpose of conduction and the iron imparting the necessary condition of strength.

Ourinven tion, therefore, consistsin acopper telegraphwire cored or covered, for the purpose of strength, with iron or steel.

In carrying out the invention or constructing this compound wire we prefer to core the copper with iron,fnst casting the copper around an iron har and then by the processes of rolling and drawing attenuating the same into wire by the well-known methods of wire-drawing. It will be obvious, however, that the iron can be placed around the copper and the resultant bar drawn out into a wire, leaving the copper in the center; but the rst-named lconstruction we consider'preferable, as the iron A #J E Tensile 5, strength. c: .".i .5 B u Pounds. v Pounds. No. 8 iron wire 381 1, S38 0003436 No. 9 iron Wire. 307 1, 479 0002760 No. 11 iron wire coveredwith copper to enl e it to No. 9 321 1, 326 00075 No. 11 steel wire enlarged to No.

9 with co per. 322 2, 049 .000794 No. 12 stee wire enlarged to Noi 10 with copper 264 l, 686 .000563 We claim- As a new article of manufacture, a telegraph-v wire re-enforced', for the purpose of strength, with a core or cover ol iron or steel, the wire being made by drawing a compound bar of the two metals.

In witness whereof we have hereunto set our hands lthis 31st day of January, A'. D. 1865.

MOSES G. FARMER. GEO. F. MILLIKEN.

Witnesses J. B. CROSBY, FRANCIS GoULD. 

